Fix Maple PATA IRQ assignment.

On the Maple board, the AMD8111 IDE is in legacy mode... except that it
appears on IRQ 20 instead of IRQ 15. For drivers/ide this was handled by
the architecture's "pci_get_legacy_ide_irq()" function, but in libata we
just hard-code the numbers 14 and 15.

This patch provides asm-powerpc/libata-portmap.h which maps the IRQ as
appropriate, having added a pci_dev argument to the
ATA_{PRIM,SECOND}ARY_IRQ macros.

There's probably a better way to do this -- especially if we observe
that the _only_ case in which this seemingly-generic
"pci_get_legacy_ide_irq()" function returns anything other than 14 and
15 for primary and secondary respectively is the case of the AMD8111 on
the Maple board -- couldn't we handle that with a special case in the
pata_amd driver, or perhaps with a PCI quirk for Maple to switch it into
native mode during early boot and assign resources properly?

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

arch/powerpc/Kconfig

@@ -484,6 +484,7 @@ config PPC_MAPLE
 	select PPC_970_NAP
 	select PPC_NATIVE
 	select PPC_RTAS
+	select ATA_NONSTANDARD if ATA
 	default n
 	help
           This option enables support for the Maple 970FX Evaluation Board.

drivers/ata/Kconfig

@@ -19,6 +19,10 @@ config ATA
 
 if ATA
 
+config ATA_NONSTANDARD
+       bool
+       default n
+
 config SATA_AHCI
 	tristate "AHCI SATA support"
 	depends on PCI

drivers/ata/libata-sff.c

@@ -917,7 +917,7 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
 	probe_ent->irq_flags = IRQF_SHARED;
 
 	if (port_mask & ATA_PORT_PRIMARY) {
-		probe_ent->irq = ATA_PRIMARY_IRQ;
+		probe_ent->irq = ATA_PRIMARY_IRQ(pdev);
 		probe_ent->port[0].cmd_addr = ATA_PRIMARY_CMD;
 		probe_ent->port[0].altstatus_addr =
 		probe_ent->port[0].ctl_addr = ATA_PRIMARY_CTL;
@@ -933,9 +933,9 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
 
 	if (port_mask & ATA_PORT_SECONDARY) {
 		if (probe_ent->irq)
-			probe_ent->irq2 = ATA_SECONDARY_IRQ;
+			probe_ent->irq2 = ATA_SECONDARY_IRQ(pdev);
 		else
-			probe_ent->irq = ATA_SECONDARY_IRQ;
+			probe_ent->irq = ATA_SECONDARY_IRQ(pdev);
 		probe_ent->port[1].cmd_addr = ATA_SECONDARY_CMD;
 		probe_ent->port[1].altstatus_addr =
 		probe_ent->port[1].ctl_addr = ATA_SECONDARY_CTL;

include/asm-generic/libata-portmap.h

@@ -3,10 +3,10 @@
 
 #define ATA_PRIMARY_CMD		0x1F0
 #define ATA_PRIMARY_CTL		0x3F6
-#define ATA_PRIMARY_IRQ		14
+#define ATA_PRIMARY_IRQ(dev)	14
 
 #define ATA_SECONDARY_CMD	0x170
 #define ATA_SECONDARY_CTL	0x376
-#define ATA_SECONDARY_IRQ	15
+#define ATA_SECONDARY_IRQ(dev)	15
 
 #endif

include/asm-powerpc/libata-portmap.h

@@ -0,0 +1,12 @@
+#ifndef __ASM_POWERPC_LIBATA_PORTMAP_H
+#define __ASM_POWERPC_LIBATA_PORTMAP_H
+
+#define ATA_PRIMARY_CMD	0x1F0
+#define ATA_PRIMARY_CTL	0x3F6
+#define ATA_PRIMARY_IRQ(dev)	pci_get_legacy_ide_irq(dev, 0)
+
+#define ATA_SECONDARY_CMD	0x170
+#define ATA_SECONDARY_CTL	0x376
+#define ATA_SECONDARY_IRQ(dev)	pci_get_legacy_ide_irq(dev, 1)
+
+#endif